Foundry molding-machine



P. PRITCHARD.

FOUNDRY MOLDING MACHINE- APPLICATION men JAN-28, 1920.

Patented July 19, 1921.

5 SHEETS-SHEET 2- I I l ATTORNEH P. PRITCHARD. FOUNDRY MOLDING MACHINE. APPLICATION FILED JAN-28, 1920.

Patented July 19, 1921.

5 SHEETS-SHEET 3- l/VVENTOR P. PRITCHARD.

FOUNDRY MOLDING MACHINE.

APPLICATION FILED JAN-28, 1920.

1,384,777. Patented July 19, 1921.

5 SHEETS-SHEET 4.

T TORNEYS.

P. PRITCHARD.

FOUNDRY MOLDING MACHINE.

APPLICATION FILED JAN.28, 1920.

M/VE/V TOP.

A TTORNEYS.

Patnted July 19,1921.

5 SHEETS-SHEET 5.

UNITED STATES PATENT" OFFICE. V

PERCY PRITCI-IARD, OI BJ IRMINGH AM. ENGLAND.

FOUNDRY MOLDING-MACHINE.

' According to this invention when the pat:

tern plate or molding table has reached a predetermined height the air pressure is released, provislon being made for supplying air to'the cylinder at atmospheric pressure when the compressor piston has reached the bottom of its stroke.

In accordance with the present invention also the molding machine comprises a driving shaft for operating the pattern plate jarring mechanism, and means for withdrawing the mold driven from such driving shaft;

Figure 1 is a" sideelevati'onof a foundry molding machine constructed according to this invention.

Fig. 2 is a front elevation of the machine shown by Fig. 1.

I Fig. 3 is a section on line X X. of Fig. 2 looking indirection of arrow a.

'fFi'g. 4 is a section elevation, the section being on line Y Y of Fig. 1.

line Z Z of Fig. 4:

' Fig. 5 1s a section on of the lifting, band, and 7 Figs. 6 and 7 are detail views hereinafter referred to.

The molding machine comprises a pattern plate 1 which is adaptedto be raised and dropped by means of'an air cushion which is alternatively compressed and the pressure released. The pattern plate 1 is bolted to the head ofthe ram 2 which is adapted to rise and fall in the cylinder 3. The piston 4. reciprocates in the cylinder 3 and therefore on the upward stroke compresses the air between the ram and the piston and thereby raises the ram, while on the downward; stroke the pressure of the air is released which allows the ram to drop.

Conveniently eight 5 inch diameter holes 50.are drilled through the wall of the cylinder so that'when the plunger or ram 2 has been raised tonn'oover these holes the air pressure is released. The plunger will, how- Specification of Letters Patent. Patented J uly 1921, Application filed January 28. 1920. SeIiaI'No. 354,600.

ever, invirtue of itsmomentum move a little distance beyond these holes beforedropping down to give the jarring effect. This return movement in this embodiment will be assisted by the suction caused by the return movement of thepiston 4. When the piston 4: reaches the bottom of its stroke the hole 51 is uncovered to allow the air above the piston to be placed at atmospheric pressure. With this construction, therefore, the extent of the upwardmovement of the plunger 2 is limited by the release of the air pressure within the cylinder to substantially atmospheric pressure. The machine could thus'be used with any weight on the molding table,

the height to which the table is raised being limited by the air release, and therefore substantially the samein all cases.

In order to provide for varying weights of molds provision is made for varying the pressure of the air cushion in the cylinder 3. According to one convenient means a plate 5 has screwed engagement with the ram 2, whereby the volume of airv inclosed between the ram 2 and piston 1' may be in creased or reduced. The plate 5 is locked in any desired position by means of the bolt 6. I he piston isreciprocated by means of the connecting-rod 7 and theeccentric 8 formed integrally with the camshaft-9 which is j ournaled'in the bearings 10 of the molding machine frame casing 54. The eccentricshaft 9 is driven from the driving. shaft 12 by means of the spur wheels 13 and 14:. The spur wheel 13 runs loosely on the shaft 12 while the spur wheel ltis bolted to the flange 15* which is formed integrally with the eccentric-shaft 9. When the machine is required to be in operation the clutch member 15, which is keyed to the shaft 12, is slid' endwise into engagement with the clutch member 16 on the spur wheel 13, as hereinafter described. The shaft 12 is driven by means of an electric motor the shaft of which carries the gear wheel 17 which is in mesh with the spur wheel 18 keyed to the shaft 12, the electric motor being bolted down to the base plate 19.

- Means for removing the mold from the move the mold when the band slides up the cylinder 3, the uprights being adjust able in slots along the--arms 2l to-allow for varying sized molds. To raise the, band 20 the screwed spindle 24 engages" the screwed projection 25 of the'bandi This screwed spindle isrotated by means, off'bevel gear wheel 26 secured to 1 such spindle; ,This 'bevel wheel is in mesh with the bevel wheels gagement with the clutch member 31 on the bevel wlieel27. A ball bearing 24 isprovided to'take the end thrust on the shaft 24.

To operate the clutch member 15,the hand lever 32is moved .over the switch board 33. The handlever 32 and lever 35 are secured to the sleeve 3.4, while the link 36 connects the rocker 5 37 .andlever 35, so that'when the hand lever is pulled over the rocker 37 moves the clutch. member 15 into engage- 1 ment with the clutch member 16;

To operate the mold lifting mechanism f the lever 38 issecured tothe spindle 39, the

movement of which, through the medium ofthe lever 40,.operates. the rocker 41 for moving the clutch member 29 into engagement with eithenthe clutch member 30 or 31. T In order to, unclutch the member 29 when the mold liftingmechanism has reached the top or bottom of its requiredmovement, suitable;- automatic means are provided. According to themeans illustratedthe rod 42 is connected..bythe.lever 43 and pin 44 to. the

rocke'r'41 so that when this rod 42 is moved up. or down the clutch member 29. is moved out ofengagementWithQ the members 30 or 31., To effect this movement at the required times the rod 42passes through a sleeve 45 on the band 20-and stops 46 and47 are provided on such rod 42. Thus when the pat tern lifting mechanism has reached the limit of its upwardmov'ement the-sleeve 45 moves against the adjustable stop 46 and lifts the rod for declutchingas aforedescribed. When the lifting, mechanism has reached the limit of its downward movement the sleeve 45 moves againstthe stop 47 and declutches as a'foredescribed. V e Thev clutch; members 29 and 15 are fitted with collar pieces 48 (Figs. 6 and 7 having trunnions 49 which engage the rockers 37 and41. The hand levers 32 and 38 are so arranged that when-the cam-shaft is rotating,

the lifting mechanism cannot be raised. For th1 purpose the upper parts of the hand levers- 32 and 38 are .arrangedin the same plane, and therefore if the lever 32is moved over for starting in motion the cam-shaft,

the lever must be moved into theneutral position shown by 2. Again/if the cam-shaft is in operation and the lever 38 is moved over for raising the lifting mechanism, the lever 32 will be moved-to de clutch "the 'member 15.. When the lifting mechanism is in the lowered position the lever 38 cannot be moved over for lowering the l'ftinggmechanism, the stop 47 preventadapted to reciprocate in such vertical cylinder, a pattern plate or molding table having a. plunger thereonentering the aircylinder and. being adapted'to be raised by the compressed air cushion formed by. said piston,

air release passage or passages'formedv in thewall of said vertical cylinder for releasingthe airpressure Whenthe molding table has reached a predetermined height,. ai r in let passage or passagesformed in the wall of the cylinder whereby Whe'n the piston reaches the bottom' of its stroke the air inside the cylinder is placed at atmospheric pressure, and mold removing mechanism slidably mounted on the wall; of, the air cylinder, substantially at set forth. p

2. A foundrymolding Imachinecomprising an airicylinder, apiston adapted to reciprocate therein, a pattern-plate ormolding table adapted to be raised by the compressed air cushion formed by said-piston,

said pattern plate being secured toa plunger reciprocating withinfthe air cylinder, and an adjustable plate or disk fitted to the plunger for varying the volume of air .inclosed between the plunger andpiston substantially as set forth. h 35A .foundry molding machine comprising a molding table or 'patternplate, a driv;

ing shaft, means for imparting a jarring action to the moldingtable driven from, said shaft, and means forwithdrawing the mold which means are driven ifromsaid driving shaft, substantially asset forth. 4. A foundry molding machine; com'prising an air cylinder, apatterniplate or molding table, a piston adapted to reciprocate within the air cylinder forr imparting. a jar ring action tothe molding. table by., compressed a1r,a driving shaft. geared to aneccentric shaft for. drivingthe jarring. mechanism and a screwed vertical spindle. driven from said driving shaft; for raising and lowering the mold lifting mechanism, substan-- tially as set forth. I

. 5.- a A foundry molding machine fGomprising an air cylinder, a patterniplate'or molding table, a piston, adapted to reciprocate withinthe air cylinder. :forimparting a jarring actionto the; molding "table 7 by; compressed alr, a driving shaftg for o crating said, piston, mold removing mechanism slidingly mounted on the wall of the air cylin-,

der and means for. operating said mold removing mechanism driven from said driving shaft, substantially as set forth.

6. A foundry moldlng machine'compris ing a molding table or pattern plate, a driv ing'shaft, means for imparting a jarring action to the molding table drivenfrom said shaft, means ,for Withdrawing the mold which means are drivenfrom said driving shaft, means whereby thedriving shaft may be placed into andout of gear with the pattern plate jarring mechanism, means whereby the driving shaft may be placed into and out of gear with the mold lifting mechanism and means whereby when the pattern plate jarring mechanismis put in operation the mold lifting mechanism is put out of gear and vice versa, substantially as set forth.

7. A foundry molding machine comprising an air cylinder, a patternplate or molding table, a piston adapted to reciprocate within the air cylinder for imparting a jarring action to the molding table by compressed air, a driving shaft geared to an eccentric shaft for driving the jarring mechanism, a screwed vertical spindle driven from said driving shaft for raising and lowering the mold lifting mechanism, means whereby the driving shaft may be placed into and out of gear with the pattern plate jarring mechanism, means whereby the driving shaft may be placed into and out of gear with the molding lifting mechanism, and means whereby when the pattern plate jarring mechanism is put in operation the mold lifting mechanism is put out of gear and vice versa, substantially as set forth. 1

8. A foundry molding machine comprising a molding table or pattern plate, a driving shaft, means for imparting a arringaclifting mechanism is put out of gear and vice versa, and means whereby the mold lifting mechanism is automatically placed out of gear with the driving shaft when the lifting mechanism has reached the bottom of its required movement, substantially as set forth.

In witness whereof I have signed this specification in the presence of two witnesses.

P. PRITCHARD.

Witnesses:

J. E. S. ROOKWOOD, J. WILniAMs. 

